AquaTech Silicone O-Ring Grease Hard shaper The lens further benefits from

The lens further benefits from the use of one extra-low dispersion element and five aspherical elements to combat aberrations as well as a Zeiss T* anti-reflective coating to keep flare and ghosting to an absolute minimum

This also means it's easier to put the tripod and head in the bag

Designed for close-up imagery

such as stars

4 DG DN from Sigma is an Art-series prime characterised by its advanced and updated optical design

AquaTech Silicone O-Ring Grease Hard shaper The lens further benefits fromThis AquaTech Silicone Grease should be used in small amounts on underwater camera housing controls that may stick. It should not be used on O rings.